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10-13-2009, 10:41 AM #2FreeDaHerb
Yellowing leaves. 5 weeks into flowering. Advice..?
Hard to tell with the HPs light but looks like a Iron or Zinc deficiency to me which happens at high PH's as it's mostly unavailable to the plant in that range, most likely your high PH is the problem..and of course plants normally do yellow and lose their leaves as they flower but yours are doing it a bit early which might affect yield somewhat. Can you get us some close up leaf pics under regular light with the HPS off? Is it the older parts of the plant or the new growth?
This might help..from onlinepot help area
Nutrients PH Problems On Marijuana Plants Spots Symptoms That Appear
Zinc Deficiencies
Deficiencies appear as chlorosis in the inter-veinal areas of new leaves producing a banding appearance as seen in figure 18. This may be accompany reduction of leaf size and a shortening between internodes. Leaf margins are often distorted or wrinkled. Branch terminals of fruit will die back in severe cases.
Also gets locked out due to high pH. Zn, Fe, and Mn deficiencies often occur together, and are usually from a high pH. Don't overdo the micro-nutrients- lower the pH if that's the problem so the nutrients become available. Foliar feed if the plant looks real bad. Use chelated zinc. Zinc deficiency produces "little leaf" in many species, especially woody ones; the younger leaves are distinctly smaller than normal. Zinc defeciency may also produce "rosetting"; the stem fails to elongate behind the growing tip, so that the terminal leaves become tightly bunched.